Error running javac in Ubuntu 11.04

[michelkogan]

I'm trying to install JDK 1.7 in Ubuntu 11.04 but when I run the following command:

javac -version

I'm getting error below:

Error: could not find libjava.so
Error: Could not find Java SE Runtime Environment.

here is some information about my system configuration for you in order to solve my problem:
The end of /etc/profile:

JDK_HOME=/usr/local/java/jdk1.7.0_04
PATH=$PATH:$HOME/bin:$JDK_HOME/bin
JAVA_HOME=/usr/local/java/jre1.7.0_04
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
export JDK_HOME
export JAVA_HOME
export PATH

output of /etc/ld.conf.so.d/java.conf :

/usr/local/java/jre1.7.0_04/lib/i386/
/usr/local/java/jre1.7.0_04/lib/i386/jli/

output of $PATH:

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/home/sahar/bin:/usr/local/java/jdk1.7.0_04/bin:/home/sahar/bin:/usr/local/java/jre1.7.0_04/bin

Please help me to solve my problem.

[k1ng]

Possible solution?

jarsiner Error (Error: could not find libjava.so)